Ubuntu 3798-2: Linux kernel (Trusty HWE) vulnerabilities

    Date22 Oct 2018
    CategoryUbuntu
    4029
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3798-2
    October 23, 2018
    
    linux-lts-trusty vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM
    
    Details:
    
    USN-3798-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04
    LTS. This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu
    12.04 LTS.
    
    Dmitry Vyukov discovered that the key management subsystem in the Linux
    kernel did not properly restrict adding a key that already exists but is
    negatively instantiated. A local attacker could use this to cause a denial
    of service (system crash) or possibly execute arbitrary code.
    (CVE-2015-8539)
    
    It was discovered that a use-after-free vulnerability existed in the device
    driver for XCeive xc2028/xc3028 tuners in the Linux kernel. A local
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2016-7913)
    
    Pengfei Ding (???), Chenfu Bao (???), and Lenx Wei (??)
    discovered a race condition in the generic SCSI driver (sg) of the Linux
    kernel. A local attacker could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code. (CVE-2017-0794)
    
    Eric Biggers discovered that the key management subsystem in the Linux
    kernel did not properly restrict adding a key that already exists but is
    uninstantiated. A local attacker could use this to cause a denial of
    service (system crash) or possibly execute arbitrary code. (CVE-2017-15299)
    
    It was discovered that a NULL pointer dereference could be triggered in the
    OCFS2 file system implementation in the Linux kernel. A local attacker
    could use this to cause a denial of service (system crash).
    (CVE-2017-18216)
    
    Luo Quan and Wei Yang discovered that a race condition existed in the
    Advanced Linux Sound Architecture (ALSA) subsystem of the Linux kernel when
    handling ioctl()s. A local attacker could use this to cause a denial of
    service (system deadlock). (CVE-2018-1000004)
    
    ??? discovered that a race condition existed in the Advanced Linux
    Sound Architecture (ALSA) subsystem of the Linux kernel that could lead to
    a use- after-free or an out-of-bounds buffer access. A local attacker with
    access to /dev/snd/seq could use this to cause a denial of service (system
    crash) or possibly execute arbitrary code. (CVE-2018-7566)
    
    It was discovered that a buffer overflow existed in the NFC Logical Link
    Control Protocol (llcp) implementation in the Linux kernel. An attacker
    could use this to cause a denial of service (system crash) or possibly
    execute arbitrary code. (CVE-2018-9518)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 ESM:
      linux-image-3.13.0-161-generic  3.13.0-161.211~precise1
      linux-image-3.13.0-161-generic-lpae  3.13.0-161.211~precise1
      linux-image-generic-lpae-lts-trusty  3.13.0.161.151
      linux-image-generic-lts-trusty  3.13.0.161.151
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    ATTENTION: Due to an unavoidable ABI change the kernel updates have
    been given a new version number, which requires you to recompile and
    reinstall all third party kernel modules you might have installed.
    Unless you manually uninstalled the standard kernel metapackages
    (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
    linux-powerpc), a standard system upgrade will automatically perform
    this as well.
    
    References:
      https://usn.ubuntu.com/usn/usn-3798-2
      https://usn.ubuntu.com/usn/usn-3798-1
      CVE-2015-8539, CVE-2016-7913, CVE-2017-0794, CVE-2017-15299,
      CVE-2017-18216, CVE-2018-1000004, CVE-2018-7566, CVE-2018-9518
    
    
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